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Summary of Significant Accounting Policies (Details Textual) (USD $)
 1 Months Ended 3 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended
Nov. 30, 2009
Nov. 30, 2008
Mar. 31, 2013
Segment
Mar. 31, 2012
Dec. 31, 2012
Mar. 31, 2013
Cash equivalents [Member]
Maximum [Member]
Dec. 31, 2011
Series A [Member]
Jun. 30, 2012
Series A [Member]
Mar. 31, 2012
Series A [Member]
May 02, 2012
Series B [Member]
Dec. 31, 2011
Series B [Member]
Jun. 30, 2012
Series B [Member]
Mar. 31, 2012
Series B [Member]
Summary of significant accounting policies (Textual) [Abstract]                          
Investments with maturities           90 days or less from the date of purchase              
Repurchase of common stock 400,000 1,034,483         8,000,000       8,000,000    
Number of Warrants exercised                       2,700,000 2,700,000
Number of warrants issued on exercise of warrants               2,700,000 2,700,000        
Number of warrants expired by terms                   5,300,000      
Term of warrant   5 years         5 years       90 days    
Per share of common stock $ 15.00 $ 23.00         $ 1.40       $ 1.25    
Impairment of goodwill     $ 0                    
Value of patent     0                    
Summary of Significant Accounting Policies (Additional Textual) [Abstract]                          
Number of Segments     1                    
impairment in investment     0 0                  
Fair value of warrant liability     9,035,000                    
Common stock per unit     $ 1                    
Warrants issued per unit     $ 1                    
Accumulated deficit     (367,507,622)   (361,091,175)                
Accumulated other comprehensive loss     (39,488)   193,177                
Goodwill     $ 1,853,042   $ 1,983,426